Aircraft Electrical Systems UPDATED
ACTUAL Exam Questions and CORRECT
Answers
An aircraft electrical circuit control relay is.....? - CORRECT ANSWER - An electrically
operated switch.
The inductor-type inverter output voltage is controlled by the.....? - CORRECT
ANSWER - DC stator field current
What is the most accurate type of frequency-measuring instrument? - CORRECT
ANSWER - Integrated circuit chip having a clock circuit.
The primary considerations when selecting electric cable size are? - CORRECT
ANSWER - Current-carrying capacity and allowable voltage drop.
The over-voltage control automatically protects the generator system when excessive voltage is
present by.....? - CORRECT ANSWER - opening the shunt field circuit.
An ammeter in a battery charging system is for the purpose of indicating the.....? - CORRECT
ANSWER - Rate of current used to charge the battery.
If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage
regulator points remain open.....? - CORRECT ANSWER - Depends on the load carried by
the generator.
A circuit protection device called a current limiter is essentially a slow-blow fuse and is designed
to be used in.....? - CORRECT ANSWER - Heavy power circuits.
How can it be determined if a transformer winding has some of its turns shorted together? -
CORRECT ANSWER - The transformer will get hot in normal operation.
, How can the direction of rotation of a dc electric motor be changed? - CORRECT
ANSWER - Reverse the electrical connections to either the field or armature windings.
Some electric motors have two sets of field windings wound in opposite directions so that
the.....? - CORRECT ANSWER - Motor can be operated in either direction.
The type of electric wire terminals used for most aircraft applications, in addition to providing
good current carrying capabilities, are designed primarily.....? - CORRECT ANSWER - To
prevent circuit failure due to terminal disconnection.
What kind of switch should you install in a single wire circuit that required the switch to be
manually held in the ON position? - CORRECT ANSWER - Single-pole, single-throw
(SPST), two-position normally open (NO).
The most common method of regulating the voltage output of a compound dc generator is to
vary the.....? - CORRECT ANSWER - Current flowing through the shunt field coils.
When handling a high voltage capacitor in an electrical circuit, be sure it.....? - CORRECT
ANSWER - Is fully discharged before removing it from the circuit.
Which of the following copper electrical cable sizes should be selected to replace a No. 6
aluminum electrical cable? - CORRECT ANSWER - No. 6
How many cycles of ac voltage are produced in a six-pole alternator of the revolving-field type
for each revolution of the rotor? - CORRECT ANSWER - Three (each pair of poles
produces one cycle of AC)
When using an ohmmeter to check the continuity of a generator field coil, the coil should.....? -
CORRECT ANSWER - Show very low resistance if it is a series field coil.
ACTUAL Exam Questions and CORRECT
Answers
An aircraft electrical circuit control relay is.....? - CORRECT ANSWER - An electrically
operated switch.
The inductor-type inverter output voltage is controlled by the.....? - CORRECT
ANSWER - DC stator field current
What is the most accurate type of frequency-measuring instrument? - CORRECT
ANSWER - Integrated circuit chip having a clock circuit.
The primary considerations when selecting electric cable size are? - CORRECT
ANSWER - Current-carrying capacity and allowable voltage drop.
The over-voltage control automatically protects the generator system when excessive voltage is
present by.....? - CORRECT ANSWER - opening the shunt field circuit.
An ammeter in a battery charging system is for the purpose of indicating the.....? - CORRECT
ANSWER - Rate of current used to charge the battery.
If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage
regulator points remain open.....? - CORRECT ANSWER - Depends on the load carried by
the generator.
A circuit protection device called a current limiter is essentially a slow-blow fuse and is designed
to be used in.....? - CORRECT ANSWER - Heavy power circuits.
How can it be determined if a transformer winding has some of its turns shorted together? -
CORRECT ANSWER - The transformer will get hot in normal operation.
, How can the direction of rotation of a dc electric motor be changed? - CORRECT
ANSWER - Reverse the electrical connections to either the field or armature windings.
Some electric motors have two sets of field windings wound in opposite directions so that
the.....? - CORRECT ANSWER - Motor can be operated in either direction.
The type of electric wire terminals used for most aircraft applications, in addition to providing
good current carrying capabilities, are designed primarily.....? - CORRECT ANSWER - To
prevent circuit failure due to terminal disconnection.
What kind of switch should you install in a single wire circuit that required the switch to be
manually held in the ON position? - CORRECT ANSWER - Single-pole, single-throw
(SPST), two-position normally open (NO).
The most common method of regulating the voltage output of a compound dc generator is to
vary the.....? - CORRECT ANSWER - Current flowing through the shunt field coils.
When handling a high voltage capacitor in an electrical circuit, be sure it.....? - CORRECT
ANSWER - Is fully discharged before removing it from the circuit.
Which of the following copper electrical cable sizes should be selected to replace a No. 6
aluminum electrical cable? - CORRECT ANSWER - No. 6
How many cycles of ac voltage are produced in a six-pole alternator of the revolving-field type
for each revolution of the rotor? - CORRECT ANSWER - Three (each pair of poles
produces one cycle of AC)
When using an ohmmeter to check the continuity of a generator field coil, the coil should.....? -
CORRECT ANSWER - Show very low resistance if it is a series field coil.
